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Old 12-29-2012, 06:00 AM
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milled intake manifold

After a head and cam change on my son's 355 Chevy, I encountered the problem with a swapmeet intake manifold that has obviously been milled. The intake will bolt on without an intake gasket, but you cannot bolt it on with a gasket, the bolt holes are too high to start the bolts on each side(the intake bolt threads are lower than the holes in the intake.)I tried another intake manifold, with a gasket, and it bolted up fine. Can I correct the milling on the swapmeet intake, or should I just buy another one?

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Old 12-29-2012, 07:40 AM
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machine formula.

A long time ago I had a chart that showed how much to mill, It depends on the machine work done to the heads and block, the percentages depended on the intake to head centerline angle vs the other dimensions centerlines, It is different % for different engines, that was done to get the bolt holes to line up. Then you needed to match the ports to the heads.
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Old 12-29-2012, 10:20 AM
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Quote:
Originally Posted by streetrodderbn View Post
After a head and cam change on my son's 355 Chevy, I encountered the problem with a swapmeet intake manifold that has obviously been milled. The intake will bolt on without an intake gasket, but you cannot bolt it on with a gasket, the bolt holes are too high to start the bolts on each side(the intake bolt threads are lower than the holes in the intake.)I tried another intake manifold, with a gasket, and it bolted up fine. Can I correct the milling on the swapmeet intake, or should I just buy another one?

Buy another one. rigging the milled one will cause other problems like oil coming out around the intake bolts.
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Old 12-29-2012, 10:38 AM
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Buy another one. rigging the milled one will cause other problems like oil coming out around the intake bolts.
Agreed, and you might have to shim distributer too.
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Old 12-29-2012, 01:09 PM
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Thats what i figured ! I tried the previous intake on the new heads, with the same gasket, it bolted up fine, But it's the wrong intake for this combination.
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Old 12-29-2012, 03:20 PM
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the block is the same, I just replaced the cylinder heads,cam and intake. The engine only has @200mi since fresh rebuild. We are just upgrading the horsepower. I still don't understand why the intake sits soo high. After inspection, even the original intake that will bolt up) sits high, Could this be from the heads being angle milled? with no gasket, the intake sits flush on all 4 sides, and the threads are centered within the intake bolt holes.
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Old 01-01-2013, 06:15 AM
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Solved the problem with a new Edelbrock Performer R.P.M.! anybody want to buy a slightly used intake/Chunk of aluminum to melt down???LOL
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